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Energy Saving MAC for MIMO Wireless Systems  

Ryoo, Sun-Heui (서울대학교 전기컴퓨터공학부, 뉴미디어통신공동연구소)
Bahk, Sae-Woong (서울대학교 전기컴퓨터공학부, 뉴미디어통신공동연구소)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.3B, 2009 , pp. 247-254 More about this Journal
Abstract
Over the last decade multiple-input and multiple-output (MIMO) systems have been actively researched and started to be deployed in wireless communications owing to the significant increase in channel capacity. In this paper, we propose a energy saving MAC protocol in systems by focusing on energy efficiency instead of capacity maximization. We considers the energy consumption together with the tradeoff between reliability (i.e., diversity) and throughput (i.e., multiplexing gain), and dynamically chooses an appropriate number of antennas for transmission. In computing the total energy consumption, we counts circuit energy as well as transmission energy. Naturally the circuit energy consumption is directly proportional to the number of active antennas. Through numerical analysis, we confirm that our power saving MAC scheme for MIMO considerably saves energy consumption compared to conventional capacity maximization schemes that use a fixed number of MIMO channels, for a given outage constraint. Our finding is that the capacity maximizing communication which possibly can be regarded best in terms of energy efficiency gives a different solution from the energy minimizing communication.
Keywords
MIMO; power saying; diversify gain; multiplexing gain; circuit power;
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